Anyone have advice on numbers for pinion depth for D30 4:11 USA standard gears and D35 4:11 Yukon gears? I've been saving pennies for a year to get this done and thought I had everything in order. I ordered all the parts and dropped it off this morning. The mechanic(highly recommended) calls me back and says all the gear sets he has installed have been stamped with numbers for the depth and these are not. He's not excited about the prospect of taking it apart several times guessing about shims. Any help?